(7xy+15)(7xy-15)=

Solution for (7xy+15)(7xy-15)= equation:

Simplifying
(7xy + 15)(7xy + -15) = 0

Reorder the terms:
(15 + 7xy)(7xy + -15) = 0

Reorder the terms:
(15 + 7xy)(-15 + 7xy) = 0

Multiply (15 + 7xy) * (-15 + 7xy)
(15(-15 + 7xy) + 7xy * (-15 + 7xy)) = 0
((-15 * 15 + 7xy * 15) + 7xy * (-15 + 7xy)) = 0
((-225 + 105xy) + 7xy * (-15 + 7xy)) = 0
(-225 + 105xy + (-15 * 7xy + 7xy * 7xy)) = 0
(-225 + 105xy + (-105xy + 49x2y2)) = 0

Combine like terms: 105xy + -105xy = 0
(-225 + 0 + 49x2y2) = 0
(-225 + 49x2y2) = 0

Solving
-225 + 49x2y2 = 0

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '225' to each side of the equation.
-225 + 225 + 49x2y2 = 0 + 225

Combine like terms: -225 + 225 = 0
0 + 49x2y2 = 0 + 225
49x2y2 = 0 + 225

Combine like terms: 0 + 225 = 225
49x2y2 = 225

Divide each side by '49y2'.
x2 = 4.591836735y-2

Simplifying
x2 = 4.591836735y-2

Take the square root of each side:
x = {-2.142857143y-1, 2.142857143y-1}